One wasn't really anyone's fault: a random collision in 2009 between a long-defunct Russian military spacecraft and an Iridium commercial communications satellite.
There are many kinds of fault happening during the test and the occurrence of faults is highly random. All these bring great difficulties to test personnel.
试验过程中故障种类多,而且故障的发生具有很大的随机性,这些都给试验人员带来极大困难。
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When Tsukiko was a girl, she blamed the death of her real-life puppy "Maromi" on a fabricated random attacker, a boy with a baseball bat, when it was really her fault.